// -----------------------------------------------------------------------------------
//
// Lightbox v2.04
// by Lokesh Dhakar - http://www.lokeshdhakar.com
// Last Modification: 2/9/08
//
// For more information, visit:
// http://lokeshdhakar.com/projects/lightbox2/
//
// Licensed under the Creative Commons Attribution 2.5 License -
// http://creativecommons.org/licenses/by/2.5/
// - Free for use in both personal and commercial projects
// - Attribution requires leaving author name, author link, and the license info
// intact.
//	
// Thanks: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas
// Fuchs(mir.aculo.us) for ideas, libs, and snippets.
// Artemy Tregubenko (arty.name) for cleanup and help in updating to latest ver
// of proto-aculous.
//
// -----------------------------------------------------------------------------------
/*
 * 
 * Table of Contents ----------------- Configuration
 * 
 * Lightbox Class Declaration - initialize() - updateImageList() - start() -
 * changeImage() - resizeImageContainer() - showImage() - updateDetails() -
 * updateNav() - enableKeyboardNav() - disableKeyboardNav() - keyboardAction() -
 * preloadNeighborImages() - end()
 * 
 * Function Calls - document.observe()
 * 
 */
// -----------------------------------------------------------------------------------
//
// Configurationl
//
LightboxOptions = Object.extend({
			fileLoadingImage : 'images/loading.gif',
			fileBottomNavCloseImage : 'images/closelabel.gif',

			overlayOpacity : 0.8, // controls transparency of shadow overlay

			animate : true, // toggles resizing animations
			resizeSpeed : 7, // controls the speed of the image resizing
								// animations (1=slowest and 10=fastest)

			borderSize : 10, // if you adjust the padding in the CSS, you
								// will need to update this variable

			// When grouping images this is used to write: Image # of #.
			// Change it for non-english localization
			labelImage : "Image",
			labelOf : "of"
		}, window.LightboxOptions || {});

// -----------------------------------------------------------------------------------

var Lightbox = Class.create();

Lightbox.prototype = {
	imageArray : [],
	activeImage : undefined,

	// initialize()
	// Constructor runs on completion of the DOM loading. Calls updateImageList
	// and then
	// the function inserts html at the bottom of the page which is used to
	// display the shadow
	// overlay and the image container.
	//
	initialize : function() {

		this.updateImageList();

		this.keyboardAction = this.keyboardAction.bindAsEventListener(this);

		if (LightboxOptions.resizeSpeed > 10)
			LightboxOptions.resizeSpeed = 10;
		if (LightboxOptions.resizeSpeed < 1)
			LightboxOptions.resizeSpeed = 1;

		this.resizeDuration = LightboxOptions.animate
				? ((11 - LightboxOptions.resizeSpeed) * 0.15)
				: 0;
		this.overlayDuration = LightboxOptions.animate ? 0.2 : 0; // shadow
																	// fade
																	// in/out
																	// duration

		// When Lightbox starts it will resize itself from 250 by 250 to the
		// current image dimension.
		// If animations are turned off, it will be hidden as to prevent a
		// flicker of a
		// white 250 by 250 box.
		var size = (LightboxOptions.animate ? 250 : 1) + 'px';

		// Code inserts html at the bottom of the page that looks similar to
		// this:
		//
		// <div id="overlay"></div>
		// <div id="lightbox">
		// <div id="outerImageContainer">
		// <div id="imageContainer">
		// <img id="lightboxImage">
		// <div style="" id="hoverNav">
		// <a href="#" id="prevLink"></a>
		// <a href="#" id="nextLink"></a>
		// </div>
		// <div id="loading">
		// <a href="#" id="loadingLink">
		// <img src="images/loading.gif">
		// </a>
		// </div>
		// </div>
		// </div>
		// <div id="imageDataContainer">
		// <div id="imageData">
		// <div id="imageDetails">
		// <span id="caption"></span>
		// <span id="numberDisplay"></span>
		// </div>
		// <div id="bottomNav">
		// <a href="#" id="bottomNavClose">
		// <img src="images/close.gif">
		// </a>
		// </div>
		// </div>
		// </div>
		// </div>

		var objBody = $$('body')[0];

		objBody.appendChild(Builder.node('div', {
					id : 'overlay'
				}));

		objBody.appendChild(Builder.node('div', {
					id : 'lightbox'
				}, [
						Builder.node('div', {
									id : 'outerImageContainer'
								}, Builder.node('div', {
											id : 'imageContainer'
										}, [
												Builder.node('img', {
															id : 'lightboxImage'
														}),
												Builder.node('div', {
															id : 'hoverNav'
														}, [
																Builder.node(
																		'a', {
																			id : 'prevLink',
																			href : '#'
																		}),
																Builder.node(
																		'a', {
																			id : 'nextLink',
																			href : '#'
																		})]),
												Builder.node('div', {
															id : 'loading'
														}, Builder.node(
																'a',
																{
																	id : 'loadingLink',
																	href : '#'
																},
																Builder.node(
																		'img',
																		{
																			src : LightboxOptions.fileLoadingImage
																		})))])),
						Builder.node('div', {
									id : 'imageDataContainer'
								}, Builder.node('div', {
											id : 'imageData'
										}, [
												Builder.node('div', {
															id : 'imageDetails'
														}, [
																Builder.node(
																		'span',
																		{
																			id : 'caption'
																		}),
																Builder.node(
																		'span',
																		{
																			id : 'numberDisplay'
																		})]),
												Builder.node('div', {
															id : 'bottomNav'
														}, Builder.node('a', {
															id : 'bottomNavClose',
															href : '#'
														}, Builder.node('img',
																{
																	src : LightboxOptions.fileBottomNavCloseImage
																})))]))]));

		$('overlay').hide().observe('click', (function() {
					this.end();
				}).bind(this));
		$('lightbox').hide().observe('click', (function(event) {
					if (event.element().id == 'lightbox')
						this.end();
				}).bind(this));
		$('outerImageContainer').setStyle({
					width : size,
					height : size
				});
		$('prevLink').observe('click', (function(event) {
					event.stop();
					this.changeImage(this.activeImage - 1);
				}).bindAsEventListener(this));
		$('nextLink').observe('click', (function(event) {
					event.stop();
					this.changeImage(this.activeImage + 1);
				}).bindAsEventListener(this));
		$('loadingLink').observe('click', (function(event) {
					event.stop();
					this.end();
				}).bind(this));
		$('bottomNavClose').observe('click', (function(event) {
					event.stop();
					this.end();
				}).bind(this));

		var th = this;
		(function() {
			var ids = 'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink '
					+ 'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose';
			$w(ids).each(function(id) {
						th[id] = $(id);
					});
		}).defer();
	},

	//
	// updateImageList()
	// Loops through anchor tags looking for 'lightbox' references and applies
	// onclick
	// events to appropriate links. You can rerun after dynamically adding
	// images w/ajax.
	//
	updateImageList : function() {
		this.updateImageList = Prototype.emptyFunction;

		document.observe('click', (function(event) {
					var target = event.findElement('a[rel^=lightbox]')
							|| event.findElement('area[rel^=lightbox]');
					if (target) {
						event.stop();
						this.start(target);
					}
				}).bind(this));
	},

	//
	// start()
	// Display overlay and lightbox. If image is part of a set, add siblings to
	// imageArray.
	//
	start : function(imageLink) {

		$$('select', 'object', 'embed').each(function(node) {
					node.style.visibility = 'hidden'
				});

		// stretch overlay to fill page and fade in
		var arrayPageSize = this.getPageSize();
		$('overlay').setStyle({
					width : arrayPageSize[0] + 'px',
					height : arrayPageSize[1] + 'px'
				});

		new Effect.Appear(this.overlay, {
					duration : this.overlayDuration,
					from : 0.0,
					to : LightboxOptions.overlayOpacity
				});

		this.imageArray = [];
		var imageNum = 0;

		if ((imageLink.rel == 'lightbox')) {
			// if image is NOT part of a set, add single image to imageArray
			this.imageArray.push([imageLink.href, imageLink.title]);
		} else {
			// if image is part of a set..
			this.imageArray = $$(imageLink.tagName + '[href][rel="'
					+ imageLink.rel + '"]').collect(function(anchor) {
						return [anchor.href, anchor.title];
					}).uniq();

			while (this.imageArray[imageNum][0] != imageLink.href) {
				imageNum++;
			}
		}

		// calculate top and left offset for the lightbox
		var arrayPageScroll = document.viewport.getScrollOffsets();
		var lightboxTop = arrayPageScroll[1]
				+ (document.viewport.getHeight() / 10);
		var lightboxLeft = arrayPageScroll[0];
		this.lightbox.setStyle({
					top : lightboxTop + 'px',
					left : lightboxLeft + 'px'
				}).show();

		this.changeImage(imageNum);
	},

	//
	// changeImage()
	// Hide most elements and preload image in preparation for resizing image
	// container.
	//
	changeImage : function(imageNum) {

		this.activeImage = imageNum; // update global var

		// hide elements during transition
		if (LightboxOptions.animate)
			this.loading.show();
		this.lightboxImage.hide();
		this.hoverNav.hide();
		this.prevLink.hide();
		this.nextLink.hide();
		// HACK: Opera9 does not currently support scriptaculous opacity and
		// appear fx
		this.imageDataContainer.setStyle({
					opacity : .0001
				});
		this.numberDisplay.hide();

		var imgPreloader = new Image();

		// once image is preloaded, resize image container

		imgPreloader.onload = (function() {
			this.lightboxImage.src = this.imageArray[this.activeImage][0];
			this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
		}).bind(this);
		imgPreloader.src = this.imageArray[this.activeImage][0];
	},

	//
	// resizeImageContainer()
	//
	resizeImageContainer : function(imgWidth, imgHeight) {

		// get current width and height
		var widthCurrent = this.outerImageContainer.getWidth();
		var heightCurrent = this.outerImageContainer.getHeight();

		// get new width and height
		var widthNew = (imgWidth + LightboxOptions.borderSize * 2);
		var heightNew = (imgHeight + LightboxOptions.borderSize * 2);

		// scalars based on change from old to new
		var xScale = (widthNew / widthCurrent) * 100;
		var yScale = (heightNew / heightCurrent) * 100;

		// calculate size difference between new and old image, and resize if
		// necessary
		var wDiff = widthCurrent - widthNew;
		var hDiff = heightCurrent - heightNew;

		if (hDiff != 0)
			new Effect.Scale(this.outerImageContainer, yScale, {
						scaleX : false,
						duration : this.resizeDuration,
						queue : 'front'
					});
		if (wDiff != 0)
			new Effect.Scale(this.outerImageContainer, xScale, {
						scaleY : false,
						duration : this.resizeDuration,
						delay : this.resizeDuration
					});

		// if new and old image are same size and no scaling transition is
		// necessary,
		// do a quick pause to prevent image flicker.
		var timeout = 0;
		if ((hDiff == 0) && (wDiff == 0)) {
			timeout = 100;
			if (Prototype.Browser.IE)
				timeout = 250;
		}

		(function() {
			this.prevLink.setStyle({
						height : imgHeight + 'px'
					});
			this.nextLink.setStyle({
						height : imgHeight + 'px'
					});
			this.imageDataContainer.setStyle({
						width : widthNew + 'px'
					});

			this.showImage();
		}).bind(this).delay(timeout / 1000);
	},

	//
	// showImage()
	// Display image and begin preloading neighbors.
	//
	showImage : function() {
		this.loading.hide();
		new Effect.Appear(this.lightboxImage, {
					duration : this.resizeDuration,
					queue : 'end',
					afterFinish : (function() {
						this.updateDetails();
					}).bind(this)
				});
		this.preloadNeighborImages();
	},

	//
	// updateDetails()
	// Display caption, image number, and bottom nav.
	//
	updateDetails : function() {

		// if caption is not null
		if (this.imageArray[this.activeImage][1] != "") {
			this.caption.update(this.imageArray[this.activeImage][1]).show();
		}

		// if image is part of set display 'Image x of x'
		if (this.imageArray.length > 1) {
			this.numberDisplay.update(LightboxOptions.labelImage + ' '
					+ (this.activeImage + 1) + ' ' + LightboxOptions.labelOf
					+ '  ' + this.imageArray.length).show();
		}

		new Effect.Parallel([new Effect.SlideDown(this.imageDataContainer, {
									sync : true,
									duration : this.resizeDuration,
									from : 0.0,
									to : 1.0
								}),
						new Effect.Appear(this.imageDataContainer, {
									sync : true,
									duration : this.resizeDuration
								})], {
					duration : this.resizeDuration,
					afterFinish : (function() {
						// update overlay size and update nav
						var arrayPageSize = this.getPageSize();
						this.overlay.setStyle({
									height : arrayPageSize[1] + 'px'
								});
						this.updateNav();
					}).bind(this)
				});
	},

	//
	// updateNav()
	// Display appropriate previous and next hover navigation.
	//
	updateNav : function() {

		this.hoverNav.show();

		// if not first image in set, display prev image button
		if (this.activeImage > 0)
			this.prevLink.show();

		// if not last image in set, display next image button
		if (this.activeImage < (this.imageArray.length - 1))
			this.nextLink.show();

		this.enableKeyboardNav();
	},

	//
	// enableKeyboardNav()
	//
	enableKeyboardNav : function() {
		document.observe('keydown', this.keyboardAction);
	},

	//
	// disableKeyboardNav()
	//
	disableKeyboardNav : function() {
		document.stopObserving('keydown', this.keyboardAction);
	},

	//
	// keyboardAction()
	//
	keyboardAction : function(event) {
		var keycode = event.keyCode;

		var escapeKey;
		if (event.DOM_VK_ESCAPE) { // mozilla
			escapeKey = event.DOM_VK_ESCAPE;
		} else { // ie
			escapeKey = 27;
		}

		var key = String.fromCharCode(keycode).toLowerCase();

		if (key.match(/x|o|c/) || (keycode == escapeKey)) { // close lightbox
			this.end();
		} else if ((key == 'p') || (keycode == 37)) { // display previous
														// image
			if (this.activeImage != 0) {
				this.disableKeyboardNav();
				this.changeImage(this.activeImage - 1);
			}
		} else if ((key == 'n') || (keycode == 39)) { // display next image
			if (this.activeImage != (this.imageArray.length - 1)) {
				this.disableKeyboardNav();
				this.changeImage(this.activeImage + 1);
			}
		}
	},

	//
	// preloadNeighborImages()
	// Preload previous and next images.
	//
	preloadNeighborImages : function() {
		var preloadNextImage, preloadPrevImage;
		if (this.imageArray.length > this.activeImage + 1) {
			preloadNextImage = new Image();
			preloadNextImage.src = this.imageArray[this.activeImage + 1][0];
		}
		if (this.activeImage > 0) {
			preloadPrevImage = new Image();
			preloadPrevImage.src = this.imageArray[this.activeImage - 1][0];
		}

	},

	//
	// end()
	//
	end : function() {
		this.disableKeyboardNav();
		this.lightbox.hide();
		new Effect.Fade(this.overlay, {
					duration : this.overlayDuration
				});
		$$('select', 'object', 'embed').each(function(node) {
					node.style.visibility = 'visible'
				});
	},

	//
	// getPageSize()
	//
	getPageSize : function() {

		var xScroll, yScroll;

		if (window.innerHeight && window.scrollMaxY) {
			xScroll = window.innerWidth + window.scrollMaxX;
			yScroll = window.innerHeight + window.scrollMaxY;
		} else if (document.body.scrollHeight > document.body.offsetHeight) { // all
																				// but
																				// Explorer
																				// Mac
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else { // Explorer Mac...would also work in Explorer 6 Strict,
					// Mozilla and Safari
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}

		var windowWidth, windowHeight;

		if (self.innerHeight) { // all except Explorer
			if (document.documentElement.clientWidth) {
				windowWidth = document.documentElement.clientWidth;
			} else {
				windowWidth = self.innerWidth;
			}
			windowHeight = self.innerHeight;
		} else if (document.documentElement
				&& document.documentElement.clientHeight) { // Explorer 6 Strict
															// Mode
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}

		// for small pages with total height less then height of the viewport
		if (yScroll < windowHeight) {
			pageHeight = windowHeight;
		} else {
			pageHeight = yScroll;
		}

		// for small pages with total width less then width of the viewport
		if (xScroll < windowWidth) {
			pageWidth = xScroll;
		} else {
			pageWidth = windowWidth;
		}

		return [pageWidth, pageHeight];
	}
}

document.observe('dom:loaded', function() {
			new Lightbox();
		});